Vulnerability-Lookup

CVE-2026-74705 (GCVE-0-2026-74705)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-25 05:41

Title

udp: fix potential use-after-free in tunnel segmentation

Summary

In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.

Severity

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/6a733a38b983d8c2e…
https://git.kernel.org/stable/c/19d89b13a43640b2d…
https://git.kernel.org/stable/c/b3df61bb745eb5201…
https://git.kernel.org/stable/c/1ae134c012e10384c…
https://git.kernel.org/stable/c/5161e67c561c4f28a…
https://git.kernel.org/stable/c/64d322c288577793e…
https://git.kernel.org/stable/c/588d4a6795d99d080…
https://git.kernel.org/stable/c/d0f86fb36eb260abd…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 6a733a38b983d8c2e222f13968209010cf44de87 (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 19d89b13a43640b2da2f277ee462d919d988cb6f (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < b3df61bb745eb5201eac22679a2839d4ccbf3442 (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 1ae134c012e10384cdac420b5cc6e0615cde0b55 (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 5161e67c561c4f28a5d9335a6e859b02511de92b (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 64d322c288577793eedd352b96ef75234ed380fe (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < 588d4a6795d99d080f74ef0b5f391ea8c453ae5d (git) Affected: dbef491ebe7f3a4fb1b9111878b86a426fd540b7 , < d0f86fb36eb260abd10007b62c9dcc1028e03e61 (git)	guessed
Linux	Linux	Affected: 4.6 Unaffected: 0 , < 4.6 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp_offload.c"
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              "version": "4.6"
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              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "5.15.216",
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: fix potential use-after-free in tunnel segmentation\n\n__skb_udp_tunnel_segment() gets the UDP header before ensuring the\ntunnel header is in the skb head. If the pull reallocates skb-\u003ehead,\nthe saved UDP header pointer is no longer valid.\n\nGet the UDP header after the pull to avoid a potential use-after-free."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Remote peers reach __skb_udp_tunnel_segment on egress when GRO-coalesced VXLAN/Geneve/FOU GSO superpackets are forwarded or re-encapsulated through dev_queue_xmit, and malicious virtio-net/cloud tenants can inject VIRTIO_NET_HDR_GSO_UDP_TUNNEL frames the host later segments on physical or overlay NICs.\nAC:L - Triggering is deterministic once a GSO UDP-tunnel skb has tunnel headers beyond skb_headlen so pskb_may_pull reallocates skb-\u003ehead; attackers control that layout via fragmented or GRO-built outer/encap headers and can repeat crafted sends until segmentation dereferences the stale UDP pointer.\nPR:N - No host authentication or credentials are required to send UDP tunnel traffic to listening overlay ports on cloud/DC nodes, and co-resident virtio-net guests or tenant VMs can emit GSO UDP-tunnel frames into the host datapath without CAP_NET_ADMIN on the victim host.\nUI:N - Exploitation needs only crafted encapsulated GSO traffic into an already-running overlay, bridge, IPVS, OVS, or virtio forwarding path; no victim file open, mount, link click, or other interactive action beyond normal network or VM I/O.\nS:C - In cloud/Kubernetes and virtio-net multitenant deployments, remote or guest/tenant senders can corrupt hypervisor kernel heap during host-side UDP-tunnel GSO segmentation on egress, crossing the VM/container-to-host security boundary rather than staying within the attacker\u0027s own namespace.\nC:H - After pskb_may_pull reallocates skb-\u003ehead, the pre-pull udp_hdr pointer is stale yet uh-\u003elen and uh-\u003echeck are read for checksum adjustment, yielding a classic heap use-after-free read primitive that can disclose kernel memory and support further exploitation.\nI:H - UAF on the UDP header allows attacker-influenced heap reuse and corruption of header fields and checksum state during tunnel GSO segmentation, providing a write/control primitive suitable for kernel code execution rather than a benign checksum miscalculation.\nA:H - Dereferencing the freed UDP header during GSO segmentation can immediately oops or panic the kernel, and repeated exploitation attempts against this UAF commonly crash or hang the host even when full control is not achieved."
            }
          ]
        }
      ],
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        "dateUpdated": "2026-08-25T05:41:48.767Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        {
          "url": "https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f"
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        {
          "url": "https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74705",
    "datePublished": "2026-08-22T15:33:04.110Z",
    "dateReserved": "2026-08-15T05:44:03.927Z",
    "dateUpdated": "2026-08-25T05:41:48.767Z",
    "state": "PUBLISHED"
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      "date": "2026-08-25",
      "epss": "0.005",
      "percentile": "0.40544"
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    "microsoft_vex": {
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      "cve": "CVE-2026-74705",
      "id": "msrc_CVE-2026-74705",
      "initial_release_date": "2026-08-24T01:06:30.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "udp: fix potential use-after-free in tunnel segmentation",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74705.json",
      "version": "2"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74705\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:45.213\",\"lastModified\":\"2026-08-25T06:18:54.870\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nudp: fix potential use-after-free in tunnel segmentation\\n\\n__skb_udp_tunnel_segment() gets the UDP header before ensuring the\\ntunnel header is in the skb head. If the pull reallocates skb-\u003ehead,\\nthe saved UDP header pointer is no longer valid.\\n\\nGet the UDP header after the pull to avoid a potential use-after-free.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/udp_offload.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"dbef491ebe7f3a4fb1b9111878b86a426fd540b7\",\"lessThan\":\"6a733a38b983d8c2e222f13968209010cf44de87\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dbef491ebe7f3a4fb1b9111878b86a426fd540b7\",\"lessThan\":\"19d89b13a43640b2da2f277ee462d919d988cb6f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dbef491ebe7f3a4fb1b9111878b86a426fd540b7\",\"lessThan\":\"b3df61bb745eb5201eac22679a2839d4ccbf3442\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dbef491ebe7f3a4fb1b9111878b86a426fd540b7\",\"lessThan\":\"1ae134c012e10384cdac420b5cc6e0615cde0b55\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dbef491ebe7f3a4fb1b9111878b86a426fd540b7\",\"lessThan\":\"5161e67c561c4f28a5d9335a6e859b02511de92b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dbef491ebe7f3a4fb1b9111878b86a426fd540b7\",\"lessThan\":\"64d322c288577793eedd352b96ef75234ed380fe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dbef491ebe7f3a4fb1b9111878b86a426fd540b7\",\"lessThan\":\"588d4a6795d99d080f74ef0b5f391ea8c453ae5d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dbef491ebe7f3a4fb1b9111878b86a426fd540b7\",\"lessThan\":\"d0f86fb36eb260abd10007b62c9dcc1028e03e61\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/udp_offload.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":10.0,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:55:04+00:00",
      "cve": "CVE-2026-74705",
      "id": "CVE-2026-74705",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: udp: fix potential use-after-free in tunnel segmentation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74705.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-23T00:04:18Z",
      "cve": "CVE-2026-74705",
      "id": "CVE-2026-74705",
      "initial_release_date": "2026-08-23T00:04:18Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74705",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74705.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-74705

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18

Severity

10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6a733a38b983d8c2e222f13968209010cf44de87",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "19d89b13a43640b2da2f277ee462d919d988cb6f",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "b3df61bb745eb5201eac22679a2839d4ccbf3442",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "1ae134c012e10384cdac420b5cc6e0615cde0b55",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "5161e67c561c4f28a5d9335a6e859b02511de92b",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "64d322c288577793eedd352b96ef75234ed380fe",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "588d4a6795d99d080f74ef0b5f391ea8c453ae5d",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            },
            {
              "lessThan": "d0f86fb36eb260abd10007b62c9dcc1028e03e61",
              "status": "affected",
              "version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/udp_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: fix potential use-after-free in tunnel segmentation\n\n__skb_udp_tunnel_segment() gets the UDP header before ensuring the\ntunnel header is in the skb head. If the pull reallocates skb-\u003ehead,\nthe saved UDP header pointer is no longer valid.\n\nGet the UDP header after the pull to avoid a potential use-after-free."
    }
  ],
  "id": "CVE-2026-74705",
  "lastModified": "2026-08-25T06:18:54.870",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 10.0,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.0,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:45.213",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-RCM8-Q4CM-988V

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

udp: fix potential use-after-free in tunnel segmentation

__skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid.

Get the UDP header after the pull to avoid a potential use-after-free.

Severity

10.0 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-74705"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:45Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: fix potential use-after-free in tunnel segmentation\n\n__skb_udp_tunnel_segment() gets the UDP header before ensuring the\ntunnel header is in the skb head. If the pull reallocates skb-\u003ehead,\nthe saved UDP header pointer is no longer valid.\n\nGet the UDP header after the pull to avoid a potential use-after-free.",
  "id": "GHSA-rcm8-q4cm-988v",
  "modified": "2026-08-25T06:31:29Z",
  "published": "2026-08-22T18:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74705"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-74705

Vulnerability from csaf_microsoft - Published: 2026-08-24 01:06 - Updated: 2026-08-24 14:49

Summary

udp: fix potential use-after-free in tunnel segmentation

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-74705

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-74705 udp: fix potential use-after-free in tunnel segmentation - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74705.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "udp: fix potential use-after-free in tunnel segmentation",
    "tracking": {
      "current_release_date": "2026-08-24T14:49:32.000Z",
      "generator": {
        "date": "2026-08-25T07:02:58.281Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-74705",
      "initial_release_date": "2026-08-24T01:06:30.000Z",
      "revision_history": [
        {
          "date": "2026-08-24T01:06:30.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-08-24T14:49:32.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.150.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-74705",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-74705 udp: fix potential use-after-free in tunnel segmentation - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74705.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-08-24T01:06:30.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "udp: fix potential use-after-free in tunnel segmentation"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-74705 (GCVE-0-2026-74705)

FKIE_CVE-2026-74705

GHSA-RCM8-Q4CM-988V

MSRC_CVE-2026-74705

Tags

Sightings

Nomenclature